A farmer has a cylindrical water tank. The tank is 4 feet tall and has a radius of 2 feet. If it is currently filled to exactly half its capacity, how many cubic feet of water are inside? (Use pi as 3)
24 cubic feet.
Volume of a cylinder is pi * r^2 * h. Here, 3 * (2^2) * 4 = 3 * 4 * 4 = 48 cubic feet total. Since it is half full, 48 / 2 = 24 cubic feet.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Hard. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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